Co-NiSe2/NF nanosheet for efficient hydrogen evolution reaction

Developing highly efficient electrocatalysts is yet an important challenge for water electrolysis. Herein, the in-situ growth of Co-doped NiSe2 on nickel foam (Co-NiSe2/NF) has been synthesized. Co-NiSe2/NF exhibited an overpotential of 136 mV at 10 mA cm−2 with a Tafel slope of 80.9 mV dec−1. In addition, the stability testing showed 92.4% of its initial HER activity after 60 h at 10 mA cm−2. The results showed that the introduction of Co tunes the electronic structure of Co-NiSe2/NF, resulting in fast reaction kinetics, and an enhanced stability due to the in situ growth of NiSe2 on the NF surface.